Which country on the Prime Meridian has the capital Ouagadougou?

• A. Mali
• B. Burkina Faso
• C. Ghana
• D. Algeria

Answer: (B)

The main idea here is longitude—the lines that run north–south and measure how far east or west a place is. The Prime Meridian is the 0-degree longitude line that stretches from the North Pole to the South Pole and passes through Greenwich, then across the globe. It also crosses parts of Africa, including Burkina Faso. Ouagadougou, the capital of Burkina Faso, sits very close to that 0-degree line, which is why Burkina Faso is the correct answer. Mali is farther west from Burkina Faso and its capital Bamako is not on the Prime Meridian, while Ghana’s capital Accra sits near 0° but not on it, and Algeria lies well north and east of that line.